Informal Letter Format in English

In this post, we will give you information about the informal letter, how to write it and when it is useful. Informal letters are also known as unprofessional letters or casual letters. 

Informal Letter

Informal letter writing is used in the place of personal communication. We all need to write a letter to someone at a certain point in our life. Also, we have to understand the meaning and also the importance of letter writing. 

To know the importance of the informal letter and write a correct letter pattern, we have to know about the letter types according to their formats.

Firstly, we have to start the letter with an opening, usually in “Dear XYZ,” in an informal letter, and an introductory sentence explaining the purpose of writing the letter below the greeting. In the body of the letter, you can elaborate on the purpose of writing the letter and provide more details.

Types of Informal Letter writing:

  • Invitation letter to a ceremony, birthday.
  • Calling letter to friend for trip/holiday.
  • Asking for the well-being of someone.
  • Asking for help from someone through a letter.
  • Congratulating letter for someone’s success or achievement
  • Marriage invitation letter.
  • Apology letter to friend or someone.
  • Informative letter about someone’s demise in family or friends.

Format of the Informal Letter

There is no particular format in the informal letter that we have to write in the formal letters. We can write the letter casually with or without applying the format sequence in informal letter writing. But if we use the format of informal letters while writing the informal letters, the letter looks good, and it will also have a positive impact on the reader’s mind.

  • Sender’s Address.
  • Date of writing a letter.
  • Salutation.
  • Introduction.
  • Main body.
  • Closing of the letter.
  • Signature of the sender.

Sender’s Address:

You have to write your address (sender’s address) whenever you write an informal letter to your friend, family members, or anyone. This has to be written because if the receiver wants to reply to your letter, they’ll write a letter and send it back to that address you mentioned.

Date of writing a letter:

Below the address point, you have to write the actual date of writing a letter to inform the receiver when the letter has been written. Try to write the date in an expanded form.

Salutation (Greeting):

You can write the salutation in a casual or personal manner like Dear mom/friend/bestie/brother / Sister, etc., accordingly. If you are writing a letter to a person with the same age as ours, you can also write their name as well. If the receiver is older than you, you have to show respect to them.


After the salutation, you have to start the actual letter. But before writing the reason for the letter, you have to begin with the introduction of the receiver side and their wellness. This will impact a good impression of your letter. 

Main body:

After the introduction, the letter’s main body begins, which includes the reason behind the letter’s writing. If you are writing a letter to your friend or person of the same age, you can write randomly or casually, but in the case of older ones, you must respect them in the letter pattern. Try to complete the body of the letter as short as you can. Avoid writing unnecessary things in the letter. 

Closing of the letter

At last, we have to write a closing letter so that we can put our letter to an end with a short summary. Write some excellent and effective words when saying goodbye to the reader.

Signature of the sender:

At last, make an end of the letter with your signature. 

For example, Lots of love, Best wishes, Kind regards, Warm regards, etc. 

Examples of Informal Letters:

Invitation letter to a ceremony/birthday:

67, Rajpath Marg,
Sector 24,
Delhi – 100378
Date: 24th November 2016

Dear Somesh,
How are you, my dear friend? How are your family members? I hope you guys are all fine there. I am also good here with your blessings. I have been writing a letter to you for a long time as I was busy with my office work and my routines are very busy.

I am writing this letter to invite you and all family members to my wife’s birthday party, which will be held in the evening on the 27th of November, 2016. I am throwing a party in my Noida’s farmhouse after sunset. I am also sending you the invitation card in which all the details of the function are given. 

You all must be present at the function, and I don’t want to hear any excuses from you. If you need any help like finding the venue, you can call me directly.

Take care, brother!
With Love,
Rajesh Kumar.

Calling letter to friend for trip/holiday:

Morya Bhavan,
Gokul Ganj,
Panipat- 800265
Uttar Pradesh
Date: 10 Dec 2019

Dear Jagan,
How are you, my friend? I hope you are doing well. It’s been a long time since we’ve met at the Conference meeting that was held in Goa. I am writing this letter to inform you that our friends are deciding to go out for a tour to celebrate our get-together. I am very excited to write about this get-together.

All of our friend circle has already given their confirmation to come and join in this trip. We will go on this upcoming Friday to the Hotel Paradise in Shimla, and we will stay there for a week. You already know about the place Shimla and also the arrangements we have to make for a tour. You just let me confirm about this trip, and we will discuss it in detail hereafter. 

I am waiting for your reply as we meet later.

Warm regards,
Sangharsh Satpute.

Asking for the well-being of someone.

Sangam Colony,
Sector 21,
Pune- 400027
Date: 18th April 2011

Dear Meghna,
I hope you are safe and protected from the adverse effect of the flu. It’s been a long time since I have been in contact with you. Due to the pandemic situation, I am working from home and just wanted to know whether you are safe or not?

We all are good and staying home and following all the precautions that the government governs. As per the update of the active cases of the corona during the pandemic, we all are unable to visit your home. 

Friend, how did you manage your work during the pandemics? Once this pandemic goes away and things go back to normal, I will come to meet you.

Hope for a positive reply from your side.
Rohan Dwivedi.

Asking for help from someone through a letter:

Shivaji Nagar,
Date: 27th Nov, 2012

Dear Sanket,
How are you, my dear friend? How about your family members? I hope you guys are all well. I am also good here with your blessings.

I was transferred to the new official site in Hyderabad and moved here last week. The new staff members are also good in behavior, and they never make me feel that I am alone. Friend, I want to purchase a car for my official work, and I want some financial help from you. I arranged some money by myself and some borrowed from my colleagues, but they are insufficient, so I am requesting you to help me as per your side. 

I am looking for your reply, and positive feedback from you and I assure you that I will pay you as I get my annual profit which I get after 3 months. 

Until then, help me as possible and take care of yourself and your family.

With love,
Ashish Chand.

Congratulating letter for someone’s success or achievement.

Anand Vihar,
Saoner- 492004
Date: 13th March 2017

My dear Ashwin, 
I hope you are well and your family is well and healthy by God’s blessings. We all are good here in Mumbai.

I am very happy to know that you got a placement in the Infosys Company in your college campus placements. My family is also sending good wishes to you for your upcoming journey and bright future ahead. We know that you struggled hard to achieve this in your career with full dedication. 

I congratulate you once again from the bottom of my heart, and I will come to meet you in Bangalore once you settle there? 

Please pay my warm regards to your parents and love to little siblings.

Suresh Shivshankar.